Centrifugal pump.



No. 704',|44. Patented luly 8, i902.'

H. suLzER.

GENTRIFUGAL PUMP. (Application med Dec, 2', 19o

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(No Model.)

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PE1 rb Q hg li l o \?\/1T ESSES NVENIR UNITnIr STATES PATENT OFFICE.

HEINRICH SIQILZER, OF VINTERTHIIR, SWITZERLAND, ASSIGNOR TO GEBRUDER SULZER, OF WINTERTHUR, SWITZERLAND.

CNTRIFUGAL. PUMP.

SPECIFICATION forming' part 0f Letters Patent No. 704,144, 'dated July 8, 1902.

Application led December Z, 1901. Serial No. 84,303. (No model.)

To all whom t may concern:

Be it known that l, HEINRICH SULZEIT., engineeI-,a citizen of the Swiss Republic,residing at lO Rychenbergstrasse, Winterthur, Switzerland, have invented certain new and useful Improvements in Centrifugal Pumps; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to high-pressure mul'- tiple centrifugal pumps driven directly by alternating-electric-current motors, in which a variation of the lift cannot be obtained by Varying the number of revolutions.

The invention consists in a special arrangement of a high-pressure multiple centrifugal pump in which the lift may be varied while the pump is driven at a constant number of revolutions.

In the accompanying drawings, Figure 1 is a longitudinal section of a centrifugal pump constructed according to this invention. Fig. 2 is a view in side elevation of a centrifugal pump embodying my invention. Fig. 3 is an end view of the same. Fig. 4 is a broken detail view, in transverse section, of a valve employed in connection with a pump embodying the principles of my invention.

There are four pumps b' b2 b3 b4 and a corresponding number of connecting-chambers c" i2 i3 4, each of which can be closed to the delivery-pipe B by a suitable valve A, communicating independently with the several pumps through pipe connections c c2 c3 ci, respectively. Vhile the pump is running there is always only one of these chambers open to the deliverypipe, the rest being closed. T/Vhen, for example, the full lift of the pump is desired, the chamber i* is opened, 0,12, and t being closed to the delivery-pipe. In this case the water enters at the intake s and passes through the ducts f' into the rst pump h and the ducts h into the annular chamber t, whence it enters pump b2 through ducts f2. The water next passes through ducts 71.2, annular chamber i2, and ducts f3 into pump b3 and then through ducts h3, chamber 3, and ducts fAl into pump b4. From here it issues through ducts h4 and chamber 4 into the delivery-pipe.

If a smaller lift be desiredfor instance, one-half-the chambers i', i3, and 'il are closed, while t2 is opened to the delivery-pipe. The water now passes through pump h2 and chamber t2 directly into the delivery-pipe Without passing through f3 to b3. Similarly the wa ter may be allowed to issue from t" or i3. The number of revolutions remains always conn stant. I do not, however, limit my claim to the special arrangement shown, since it will be readily seen that various arrangements or shapes of ducts and valves would act in the same way without in any way altering the nature of my present invention.

The invention is broadly constituted by dividing up a centrifugal pump corresponding to the required maximum power into a suitable number of smaller pumps connected in series and by connecting every single pump with the main outlet by a valve which can be closed or opened as the requirements of Work may dictate, thus obtaining as many diderent heights of lift as divisional pumps are proa vided, though a constant speed is retained.

The power consumed by the multiple pump varies with the increase or decrease of the number of pumps through which the water passes and is greatest when the Water flows through all four pumps and least when it flows through the irst pump only.

I-Iaving now particularly described and as certained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is A centrifugal pump adapted to be driven at a constant speed and comprising a plurality of pump-sections arranged in series relation with respect to each other, each pumpsection communicating independently with the outlet, whereby by opening one or the other of such communications the lifting power of the pump may be varied without varying its speed, as and for the purpose set forth.

In witness whereof I have hereunto set my hand in presence of two Witnesses.

HEINRICH SULER.

Witnesses i FREDERICK BASLER, Annnncnr VILLINennI 

